⚖️ Comparison · Updated for 2026
DDR4 RAM vs DDR5 RAM
Side-by-side comparison, when-to-use-each guide, and instant conversion. Reviewed for 2026.
Quick answer: DDR5 (2021): up to 6400 MT/s base, double the bandwidth of DDR4. Higher capacity per module (up to 128 GB), on-die ECC. DDR4 (2014): still widely available, cheaper, supported by older motherboards. For new builds in 2026: DDR5 is the default; DDR4 only if budget-constrained or building on a DDR4 motherboard.
Decision guide — when to use which
Use DDR4 RAM when…
Existing DDR4 systems, budget builds, AM4 socket motherboards.
Use DDR5 RAM when…
All new builds (2024+), Intel 12th gen+, AMD AM5, performance-sensitive workloads.
📊 Side-by-side comparison
| Aspect | DDR4 RAM | DDR5 RAM |
|---|---|---|
| Base speed | 2133-3200 MT/s | 4800-6400 MT/s base |
| Max module size | 64 GB | 128 GB |
| Voltage | 1.2V | 1.1V |
| Channels per DIMM | 1 | 2 (subchannels) |
| ECC | Optional | On-die (basic protection) |
Frequently asked
?
Is DDR5 twice as fast in real terms?
In benchmarks, yes (4800 MT/s vs 3200 MT/s base). In real-world apps, the difference is 5-15% depending on workload. Memory-bound tasks (large file editing, simulations) benefit most. Games typically see 5-10%.
?
Can I mix DDR4 and DDR5?
No — different physical slots, different voltages. Your motherboard supports one or the other. Some early Intel boards (LGA 1700) come in both DDR4 and DDR5 variants.
Reviewed for 2026. All conversion factors and historical references verified against official sources (ISO standards, government weights & measures legislation, IEC technical specifications). Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project. We don't sell SEO links or accept paid placements in this content.